Method of making lacquers



Patented Mar. 27,1928.

UNITED "STATES KURT scnmmmenn, or uEuKoLLN, GERMANY.

- METHQD or MAKING LACQUEBS.

No Drawing. Application filed July 1, 1925,. Serial No; 40,960, and inGermany Key 18, 19215.

My invention relates to a method of making lacquer and it is an objectofmy invention to provide a method by which a lacquer is obtainedwithout the percentage of acid I or saponifiable constituents which isusually found in lacquers and renders them unsuitable for certainpurposes, as they destroy. certain colours such as luminous c'olours.

. It has often been attempted'to make lacquers without the saidobjectional constituents by eliminating the acid constituents of resinswith oneor morevalence'alcohols or phenols or by neutralizing-the freeacid with basic agents. However, all these attempts in were failures asall-lacquers so made contain a certain though small, percentage, of acidand saponifiable constituents and destroy very delicate colours, asexplained above.

I have found that it is possible to obtain a i lacquer without theslightest traces of such constituents by. dissolving the initial mate-'rial, which may be any natural or artificial resin, in a suitablesolv'ent and saponifying with a quantity of alcoholic potash slightly inexcess of that calculated. The solution so obtained'which contains allacid and saponifiable constituents'as resin soaps, is diluted with waterin a decanter and the watery alcoholic soap solution is separated fromthe balanceot' the solution. This latter, after having been thoroughlycleaned, contains the un'saponifiable constituents which are obtained assolids by evaporatingthe solvent and are treated vwith oiie of the usuallacquer solvents to which'may be added drying oils and siccative.' 5

' Emample. Suppose the initial material to be amber material isdissolved in benz'ol and saponified potash slightly in excess of. thatcalculated.

- and siccative and diluting agents are added.

PATENT orrice.

colophony. Any suitable quantity of this 40 in hot condition with aquantity of a coholic The solution 'so obtained is diluted with water ina decanter and the alcoholic watery 46 3 soap solution is separatedfrom-the benzol. The separated solution is diluted with water until ,thelast traces of the soap have been eliminated, that .is', anemulsionis nolonger formed, Tlie' obtained benzol solution is 80 then dIiGd'l-Wlth' asuitable agent such as chloride of calcium, Glauber salt or the like andthen theunsaponifiable percentage ofthe resin is obtained by evaporatingthe benzol.

This percentage is boiled with wood oil In this manner an absolutelyendurin lacquer of highquality is obtained whic can be used with themost delicate colours without aifecting them.

I claim: v Method of makin ,laoquer consisting in dissolving resininenzol, saponifying the v dissolved resin by the use of heated alcholicpotash, separating the obtained soap solu-- tion from the unsaponifiableconstituents dissolved in the first solvent, and obtaining saidunsaponified constituents by evaporating the solvent. 7 I

In testimony whereof I have signed this specification in the presence ofone witness.

YY-KURT soHMIniNeER.

